Aluminum-solder.



No Drawing.

posed.

from impurities it is prepared in vessels UNITED s'r T-Es PATENT OFFICE.

JOSEPH SILVER, on NEW- YonK, N. Y."

\LU'IVIINUlVI-SOIJDER.

useful Improvements in Aluminum-Solder,

of which the following is a specification.

This invention has reference tonovel aluminum solder and the process ofproducing num parts which is easily prepared and applied and gives bestand uniform results.

In addition tothese main objects it has been sought to keep the cost ofproduction low so as to make the novel solder a. gene 'al commodity.tained by the use of a simple process of 1,)roducing same and thecareful selection of the materials of which the solder-is com- In orderto obtain the solder free which will not impart undesirable anddetrimental substances thereto during the process of.manufacture. Theutensils en'iploycd in making the solder likewise keep it free fromimpurities and the casting of the solder bars or rods is carried out insuch manner that the same renmin pure.

' in carrying the present invention into effect l sul'ist-antiallyproceed as follows: First a graphite .-1.'ucible is carefully heatedfrom below so that. the [lame does not touch the top opening of same.Now aluminum is placed into the crucible and the heat raised to about(150 (X, then magnesium 'is put in and before same fuses tin and cadmiumare added. .\'lcan\vhile the heat gradually rises and the mass fuses.\Vhen fused the mass is stirred with a well dried pine wood rod toobtain a homogeneous composition. stirring a llux, such as borax, isadded to prevent surface oxidation. The melted mixture is cast into rodsor bars in mold sand.

lraphite. the matcrial'of the crucible em-.

ployed in the process of making the novel aluminum solder can not impartany impurities to the composition because it'consists ofcarbon whichhasa rather deoxidizing effect. The well dried pine rod used forstirring consists of organic substance which forms carbon when incontact with the Specification :of Letters Patent. Application filedNovember 9, 1909.; Serial No. 527,100.

This has been primarily at-' J\ fter Patented Aug. 23, 1910.

melted mixture and therefore also has a deoxidizing effect. Ironcruciblessand stirring rods heretofore used tend to impart impurities tothe resultingcomposition. Thus a pure alloy is obtained which, when usedas an aluminum solder does not produce any bad spots in the solderedjoints.

The proportions of the components of the new aluminum solder aresubstantially as follows: For 100 parts of solder l. use in the abovedescribed order substantially 10.8 of aluminum,

2. 75% of magnesium, 85.1 of tin, and

of cadmium The solder ol' the above composition answers all practicalpurposes. For rather expensivearticlcs, however, the cadmium may bereplaced by a like percentage of platinum, that is 1.35% of platinum maybe used in place of cadmium. This solder is pref erable but the cost ofproducing it is somewhat increased by the presence of the ratherexpensive platinum.

The metals employed in the manufacture of the noyel solder must be purebut particularly the tin must be as. pure as possible.

I claim as my invention:

1. As a novel composition of matter an aluminum solder composedessentially of aluminum, magnesium, tin, and cadmium.

2. As a novel composition of matter an aluminum solder composedsubstantially of 10.8 per cent. of aluminum, 2.75 per cent. ofmagnesium, 85.1 per cent. of tin, and

per cent. of cadmium.

3. The process of producing an ahnninu'm solder consisting in heating acarbon crucible to a temperature below the fusion point of aluminum,introducing alnminnm,then magnesium, and before same fuses tin andcadmium, and stirring the mass when fused.

.- 5, Th processlof producing aiialuminum", Signed at New York, N. Y.,this 8th day solder consisting in heating a graphite cruciof November,1909. A

ble tqaboutia temperature of -65Q 0., in- JOSEPH SILVER;

troducmg alummum, then magneslum, then I 5 pure tin and cadmium,inorea'singQthe 'tem- Witnesses:-

perature until the mass fuses, stirring same, LUDWIG K. B6HM,'

and adding a flux. 003mm. MYERS.

